/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Class
	Foam::zero

Description
	A class representing the concept of 0 used to avoid unnecessary
	manipulations for objects that are known to be zero at compile-time.

SourceFiles
	zeroI.H

\*---------------------------------------------------------------------------*/

#ifndef zero_H
#define zero_H

#include "label.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{


class zero
{
public:

	typedef zero value_type;

	// Constructors

		//- Construct null
		zero()
		{}


	// Member operators

		//- Return 0 for bool
		inline operator bool() const
		{
			return 0;
		}

		//- Return 0 for label
		inline operator label() const
		{
			return 0;
		}

		//- Return 0 for float
		inline operator float() const
		{
			return 0;
		}

		//- Return 0 for double
		inline operator double() const
		{
			return 0;
		}
};


// Global zero
static const zero Zero;


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#include "zeroI.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
